This repo may be mis-reporting histogram references

[justinmchase]

This repo appears to be mis-reporting histogram.enable() as a lingering reference:

Related to siimon/prom-client#494

# ELDHISTOGRAM
node:internal/async_hooks:201                                                   
node:internal/perf/event_loop_delay:81                                          
node:internal/perf/event_loop_delay:78                                          
/var/app/example/node_modules/prom-client/lib/metrics/eventLoopLag.js:47 - const histogram = perf_hooks.monitorEventLoopDelay({
/var/app/example/node_modules/prom-client/lib/defaultMetrics.js:43       - metric(config.register, config);

This was reported upstream to nodejs nodejs/node#42132 and they concluded histograms should not be showing here since they are unref'd at the runtime level. Therefore we suspect that it may be a false positive here in this repo.

I see that you have a number of other types blocklisted here:

why-is-node-running/index.js

Lines 8 to 11 in 24fb4c8

	var hook = asyncHooks.createHook({
	init (asyncId, type, triggerAsyncId, resource) {
	if (type === 'TIMERWRAP' || type === 'PROMISE') return
	if (type === 'PerformanceObserver' || type === 'RANDOMBYTESREQUEST') return

I'm wondering if histogram's should be added here as well?

[twpol]

Might be fixed by #60?

[RaisinTen]

#60 has just landed and it has been released in v2.2.2. Could you please check if this is still an issue?